Function gluon_base::types::walk_move_type_opt

pub fn walk_move_type_opt<F: ?Sized, I, T>(
    typ: &Type<I, T>, 
    f: &mut F
) -> Option<T> where
    F: TypeVisitor<I, T>,
    T: TypePtr<Id = I> + Clone,
    T::Types: Clone,
    T::Generics: Clone,
    T::Fields: Clone,
    T::TypeFields: Clone,
    T::SpannedId: Clone,
    I: Clone,